[flexcomponents] Adding itemRenderer support

[Alberto Albericio]

Hello all,

Im creating a new component from scratch and I want to add itemRenderer 
support to it. Basically, it is a vertical repeater that accepts custom 
itemRenderers to render data.

I have almost everything working but there's one point where I dont see 
the light :)

My component extends from UIComponent and I create the renderers inside 
the commitProperties function:

                    var renderer: * = _itemRendererFactory.newInstance();
                    IDataRenderer(renderer).data = _items[i];
                    renderers[i] = renderer;
                    renderer.x = 0;
                    renderer.y = i * ( this._rowHeight + 
this._verticalGap );
                    addChild(renderer);


Now, inside the updateDisplayList ( where I obtain the container's width 
) I resize the renderers:

                   for each( var renderer: * in renderers ) {
                        renderer.width = this.width;
                        renderer.height = this._rowHeight;
                    }

This works if this._rowHeight == CustomRenderer.mxml's height BUT 
imagine I have a fixed height for the itemRenderer bigger than 
this._rowHeight. Lets say I use CustomRenderer.mxml ( an HBox with 
height="40" ), then, this component SHOULD show scrollbars on every 
renderer but, instead, it doenst show any scrollbar and thus I can only 
see the first this._rowHeight pixels defined for every renderer.

What am I doing wrong?

Thanks

Alberto